cubicweb-fresh #6304816 tb when creating an Expense [open]

fresh (cubicweb.web) ERROR: unexpected error while validating form
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/basecontrollers.py", line 213, in _validate_form
ctrl.publish(None)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/editcontroller.py", line 130, in publish
self._default_publish()
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/editcontroller.py", line 207, in _default_publish
self.handle_formfield(form_, field)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/editcontroller.py", line 290, in handle_formfield
for field, value in field.process_posted(form):
File "/usr/lib/python2.7/dist-packages/cubicweb/web/formfields.py", line 491, in process_posted
value = field.process_form_value(form)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/formfields.py", line 1143, in process_form_value
value = self._process_form_value(form)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/formfields.py", line 1171, in _process_form_value
form._cw.data['pending_others'].add( (form, self) )
KeyError: 'pending_others'
form._cw.data['pending_others'].add( (form, self) )
KeyError: 'pending_others'
prioritynormal
typebug
done in<not specified>
closed by<not specified>